AST-2013-001: Prevent buffer overflow through H.264 format negotiation

The format attribute resource for H.264 video performs an unsafe read against a
media attribute when parsing the SDP. The value passed in with the format
attribute is not checked for its length when parsed into a fixed length buffer.
This patch resolves the vulnerability by only reading as many characters from
the SDP value as will fit into the buffer.

(closes issue ASTERISK-20901)
Reported by: Ulf Harnhammar
patches:
  h264_overflow_security_patch.diff uploaded by jrose (License 6182)
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Merged revisions 383973 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@383975 f38db490-d61c-443f-a65b-d21fe96a405b
AST-2013-002: Prevent denial of service in HTTP server

AST-2012-014, fixed in January of this year, contained a fix for Asterisk's
HTTP server for a remotely-triggered crash. While the fix put in place fixed
the possibility for the crash to be triggered, a denial of service vector still
exists with that solution if an attacker sends one or more HTTP POST requests
with very large Content-Length values. This patch resolves this by capping
the Content-Length at 1024 bytes. Any attempt to send an HTTP POST with
Content-Length greater than this cap will not result in any memory allocation.
The POST will be responded to with an HTTP 413 "Request Entity Too Large"
response.

This issue was reported by Christoph Hebeisen of TELUS Security Labs

(closes issue ASTERISK-20967)
Reported by: Christoph Hebeisen
patches:
  AST-2013-002-1.8.diff uploaded by mmichelson (License 5049)
  AST-2013-002-10.diff uploaded by mmichelson (License 5049)
  AST-2013-002-11.diff uploaded by mmichelson (License 5049)
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Merged revisions 383978 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@383980 f38db490-d61c-443f-a65b-d21fe96a405b